From: Dmitry A. Kazakov <mailbox@dmitry-kazakov.de>
Subject: Re: Need advice re package organization.
Date: Thu, 31 Jul 2003 11:04:59 +0200
Date: 2003-07-31T11:04:59+02:00 [thread overview]
Message-ID: <jtkhivs294g51t3mfdbbj84mbcq1amn7fe@4ax.com> (raw)
In-Reply-To: clWVa.4191$mv6.741217@news20.bellglobal.com
On Wed, 30 Jul 2003 17:00:00 -0400, "Warren W. Gay VE3WWG"
<ve3wwg@cogeco.ca> wrote:
>Dmitry A. Kazakov wrote:
>> Such subroutines could be viewed as an
>> equivalent to C++'s "private methods". What Ada does not have are
>> private data members in C++ sense. So we have:
>>
>> protected in C++ <--> private in Ada
>> private method <--> a subroutine in the body [a FAT plus to Ada ]
>> private member <--> missing [a minus]
>
>I think you need to add a dimension to this "chart", because
>there are multiple (at least 2) views:
>
> 1. simple client view
> 2. a _normal_ child package view
>
> (a _private_ child's view is the same I think, but if not, this
> is a 3rd).
>
>The problem I am trying to address, is #2. The child package sees
>all, even when you don't want it to.
But if you do not want to see private things, then the package should
not be a child.
-----------------------------------------
However I should admit that there is a problem, not only in Ada, but
it other OO languages too. It is a "philosophic" problem:
"When implemening a method should I favour private or public
interface?"
Note that this problem exists even for a single package / class. Let I
have a public Getter for some hidden member, should I use it instead
of accessing the member directly implementing some other method?
There is no definite answer to this, but in what a language (Ada)
could help is in a clear separation of both.
As a raw idea, one could have public and private parts of the package
body. Or alternatively, one could have up to two bodies, private and
public:
package [private] body A is
-- I see everything
-- All dirty stuff goes here
end A;
package public body A is
-- I see only the public part
-- I need not review this body as long as the public part
-- remains unchanged
end A;
---
Regards,
Dmitry Kazakov
www.dmitry-kazakov.de
next prev parent reply other threads:[~2003-07-31 9:04 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-26 13:08 Need advice re package organization Bobby D. Bryant
2003-07-26 14:25 ` Robert I. Eachus
2003-07-26 15:27 ` Warren W. Gay VE3WWG
2003-07-26 22:00 ` Robert I. Eachus
2003-07-27 22:01 ` chris
2003-07-28 2:53 ` Robert I. Eachus
2003-07-29 4:52 ` Richard Riehle
2003-07-27 22:02 ` Warren W. Gay VE3WWG
2003-07-28 8:38 ` Dmitry A. Kazakov
2003-07-29 17:18 ` Warren W. Gay VE3WWG
2003-07-30 8:42 ` Dmitry A. Kazakov
2003-07-30 21:00 ` Warren W. Gay VE3WWG
2003-07-30 22:46 ` Randy Brukardt
2003-07-31 16:39 ` Warren W. Gay VE3WWG
2003-07-31 17:31 ` Randy Brukardt
2003-07-31 21:00 ` Warren W. Gay VE3WWG
2003-07-31 22:13 ` Robert I. Eachus
2003-08-01 12:51 ` Warren W. Gay VE3WWG
2003-07-31 5:57 ` Matthew Heaney
2003-07-31 16:57 ` Warren W. Gay VE3WWG
2003-07-31 22:33 ` Robert I. Eachus
2003-08-01 2:58 ` Chad R. Meiners
2003-08-01 13:51 ` Stephen Leake
2003-08-01 22:15 ` Robert I. Eachus
2003-08-04 13:45 ` Stephen Leake
2003-08-01 13:01 ` Warren W. Gay VE3WWG
2003-07-31 9:04 ` Dmitry A. Kazakov [this message]
2003-07-31 16:59 ` Warren W. Gay VE3WWG
2003-07-31 20:41 ` Randy Brukardt
2003-07-31 21:15 ` Warren W. Gay VE3WWG
2003-08-01 20:04 ` Randy Brukardt
2003-08-01 21:33 ` Stephen Leake
2003-08-04 19:40 ` Randy Brukardt
2003-08-04 19:52 ` Stephen Leake
2003-08-05 3:36 ` Richard Riehle
2003-08-05 4:03 ` Hyman Rosen
2003-08-05 7:16 ` Dmitry A. Kazakov
2003-07-26 17:03 ` Nick Roberts
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox